const currentYear = new Date().getFullYear();
const fromMonth = new Date(currentYear, 0);
const toMonth = new Date(currentYear + 10, 11);

// Component will receive date, locale and localeUtils props
function YearMonthForm({ date, localeUtils, onChange }) {
  const months = localeUtils.getMonths();

  const years = [];
  for (let i = fromMonth.getFullYear(); i <= toMonth.getFullYear(); i += 1) {
    years.push(i);
  }

  const handleChange = function handleChange(e) {
    const { year, month } = e.target.form;
    onChange(new Date(year.value, month.value));
  };

  return (
    <form className="DayPicker-Caption">
      <select name="month" onChange={handleChange} value={date.getMonth()}>
        {months.map((month, i) => <option key={i} value={i}>{month}</option>)}
      </select>
      <select name="year" onChange={handleChange} value={date.getFullYear()}>
        {years.map((year, i) =>
          <option key={i} value={year}>
            {year}
          </option>
        )}
      </select>
    </form>
  );
}

export default class Example extends React.Component {
  state = {
    month: fromMonth,
  };
  handleYearMonthChange = month => {
    this.setState({ month });
  };
  render() {
    return (
      <div className="YearNavigation">
        <DayPicker
          month={this.state.month}
          fromMonth={fromMonth}
          toMonth={toMonth}
          captionElement={
            <YearMonthForm onChange={this.handleYearMonthChange} />
          }
        />
      </div>
    );
  }
}
